Constant voltage system



June 19, 1934. v osNos 1,963,243

CONSTANT VOLTAGE SYSTEM Filed May 9, 1930 INVENTOR MEN DEL O NOSATTORNEY Patented June 19, 1934 1,903,243 9 v v cons-rm VOLTAGE sismlMendelmos,l3erlin,

fnnken Gcsellschaft Gemm.mmrure|efur Drahtloso Tele- 1mphiemhH.,BerIin,Germany,aoorporatlon of Germany Amman. May a 1930,Serial No. 451,024 In Germany May 11, 1929 it"Claims. (01. 111-119) Thisinvention relates system. u

An object of this invention is to design an electrical network in such away that the potential I value for the load can be made to beindependent of the current fluctuations in the load. 3

Other objects of this invention will be apparent from the followingspecification when read in connection with the drawing, the singlefigure of 10 which shows diagrammatically a system designed inaccordance with my invention. In alternating current equipment comprisina transformer T between the consumer or load 1': and the primaryelectromotive force E1 (see drawing), it is often desirable that thesecondary terminal potential K: should be independent of the load. Inother words, the ratio to a constant voltage should be entirelyindependent of the load, or

nearly so. I

According to this invention, this aim is attained by so choosing theprimary and the secondary g5 capacities C1 and C: that the followingequation will be satisfied: a I

30 where m is the capacitive reactance of the circuit "It-can bedemonstrated that this condition is tantamount to this othercondition, 1. e., that the primary and the secondary capacities are sochosen that by connecting the secondary capacitive reactance in thesecondary circuit, the secondary short-circuit current, under otherwise00 equal conditions, is doubled or nearly so.

Having now described my. invention, what I claim and desire to secure byLetters Patent is the following:

1. In a power network, a primary circuit including reactive elements andthe primary of a transformer said primary circuit as a whole having acapacitive reactance of any desired value including zero, a secondarycircuit including reactive elements and the secondary of saidtransformer, said secondary circuit having a capacity reactance which issubstantially equal to 2 1 2-71 2 W I where I: is the secondaryinductive reactance of the transformer, :m is the ohmic valuecorresponding to the co-emcient of mutual inductance between the twotransformer windings, :1 is the inductive reactance of the primarycircuit of the transformer and m is the capacitive reactance of theprimary circuit of the transformer.

2. In a power supply network a primary circuit including capacitivereactance and a secondary circuit including capacitive reactance, atransformer for coupling primary and secondary circuits said primary andsecondary circuits being related to each other to the extent that thecapacity reactance of the secondary circuit is substantially equal towhere x: is the secondary inductive reactance of the transformer, 1:1:is the ohnlic value corresponding to the co-eflicient of mutualinductance between the two transformer windings, :1 is the inductivereactance of the primary circuit of the transformer and m is thecapacitive reactance of the primary circuit of the transformer.

